Hello, I need a hero, please. I have connected my Panasonic TC-L42U5 tv my HP a6433w computer (running Windows Vista), using HDMI cable. Okay, I an use the tv screen as a computer monitor. My goal is to get the tv to output the sound to my computer speakers, which are plugged into the Realtek audio card. All I really have for audo out on the tv is a digital coaxial out, and that is plugged into the digital in on my hp. But I get no sound. What can I do?